WL400 WATER LEVEL SENSOR
Submersible Pressure Transducer for Level & Pressure
- High accuracy and reliability
- Completely submersible pressure transducer and cable
- Compact, rugged design for easy installation
- Minimal maintenance and care
- Water level sensor compatible with most monitoring equipment
- 4-20mA output
- Vented cable for automatic barometric compensation
- Multiple level ranges available from 3' to 500'
- Wet-wet water level sensor eliminates vent tube concerns
- Dynamic temperature compensation system
- Submersible pressure transducer not affected by foam, wind, or rain
- Monitors levels in groundwater wells, rivers, streams, tanks, lift
stations and open channels
- CE Certified
Water Level Sensor Product Description
Global Water's WL400 Water Level Sensor provides highly accurate water level
measurement for a wide variety of applications, including those in severe
environments. The submersible pressure transducers have a dynamic temperature
compensation system, enabling high accuracy measurements over a wide temperature
range. The water level sensor is easily adapted to all dataloggers, telemetry,
monitoring equipment, and displays.
Each of the water level sensors consist of a solid state submersible pressure
transducer encapsulated in a stainless steel 13/16" diameter housing. The water
level sensor has a molded-on waterproof cable and a two-wire 4-20 mA high level
output for connection to a monitoring device. A 25' cable is standard, and
optional cable lengths are available up to 500'.
The Water Level Sensor's submersible pressure transducer is fully
encapsulated with marine-grade epoxy so that moisture can never leak in or work
its way down the vent tube to cause drift or level sensor failure (as is the
case with other pressure sensors). The water level sensor uses a unique, highly
flexible silicon diaphragm to interface between water and the sensing element.
This silicon diaphragm protects the water level sensor's electronics from
moisture and provides each sensor with exceptional linearity and very low
hysteresis. The design of the submersible pressure transducers eliminates the
issues associated with metal foil diaphragms, which tend to crinkle and stretch
out over time causing drift, linearity, and hysteresis problems. The water
level sensor is also has automatically barometric compensation due to the
attached vent cable and protected by a stainless steel micro-screen cap, which
makes fouling with silt, mud, or sludge virtually impossible. The water level
sensor's design is great for all saltwater applications including tide level
monitoring, floating docks, and others.
Pressure transducer level ranges of 0-3', 0-15', 0-30', 0-60', 0-120',
0-250', and 0-500' are available. The 0-3' low-level range is ideal for
measuring shallow flows or small water level changes like those encountered in
sewers, storm drains, weirs, and flumes. The 0-3' water monitoring sensor
accurately measures small changes in water, even when the water's depth is only
a few inches deep. Other metal foil-type water level sensors typically have
serious problems at low-level ranges because of sensor crinkling, stretching,
Each submersible pressure transducer has a two-wire 4-20 mA output signal
that is linear with water depth. From 10 to 36 VDC is required to operate the
water level sensor, so the level sensors can be operated from common 12 VDC
battery systems. The 4-20 mA signal can run up to 3,000' from the submersible
pressure transducer to the logging device. Common twisted pair or electrical
extension cord wire may be spliced to the vented cable once the cable is out of
the water. The 4-20 mA signal may be converted to 0.5 to 2.5 VDC by dropping
the current signal across a 125 ohm resistor.
Water Level Sensor Specifications
Sensor Element: Silicone Diaphragm, Wet/Wet Transducer
Pressure Range: 0-3', 0-15', 0-30', 0-60', 0-120', 0-250', 0-500'
Linearity and Hysteresis: ±0.1% FS
Accuracy: ±0.1% of full scale at constant temperature, ±0.2% over 35°F to
Overpressure: Not to exceed 2 x full scale range
Resolution: Infinitesimal (Analog)
Outputs: 4-20 mA or 0.5 to 2.5 VDC across 125 ohms
Supply Voltage: 8 to 36 VDC
Current Draw: Same as sensor output
Warm Up Time: 3 seconds recommended
Operating Temperature: -40° to +185°F
Compensation: Uses dynamic temperature compensation 30-70 F. Automatic
barometric pressure compensation
Weight: 1/2 lb (227 g)
Material: 304L Stainless Steel, SS microscreen (hundreds of holes to
prevent fouling), electronics are fully encapsulated in marine grade epoxy,
guaranteed not to leak
Size: up to 13/16" diameter x 5 1/2" long (2 cm dia. x 14 cm long)(small
enough for a 1" well)
Conductors: 4 each 22 AWG
Jacket Material: Marine Grade Polyether
Vent Tube Material: HD Polyethylene
Shield: Aluminum Mylar
Outer Diameter: 0.306"
Temperature Range: -22° to +185°F
Weight: 0.7 oz/ft
Length: Standard 25' (up to 500' from the factory)
Water Level Sensor Installation
The submersible pressure sensor may be placed slightly below the lowest
expected water level. Water level sensor level ranges of 0-3', 0-15', 0-30',
0-60', 0-120', 0-250' and 0-500' are available. When ordering, select the level
sensor range that will cover the maximum water level change (this is not
necessarily the total depth of water). Selecting the smallest water level range
possible will ensure the greatest accuracy.
The 4-20 mA signal can run up to 3,000' from the water level sensor to the
logging device. Common twisted pair or electrical extension cord wire may be
spliced to the vented cable once the cable is out of the water. The 4-20 mA
signal may be converted to 0.5 to 2.5 VDC by dropping the current signal across
a 125 ohm resistor.
Water Level Sensor Applications
The WL400 Water Level Sensor can be used to measure water level, well depth,
groundwater level, surface water flow, pipe flow, and water pressure, etc...
NOTE: Polyurethane cable is not recomended for use with hydrocarbons or high
concentrations of chlorine. Please look at the our WL450 Water Level
Transmitter to meet the requirements of these types of applications.
Water Level Sensor Options
|WL400 Water Level Sensor
When ordering, specify water level range that will cover the maximum water
level change for your application (this is not necessarily the total depth
of water): 0-3', 0-15', 0-30', 0-60', 0-120', 0-250', and 0-500'. NOTE:
There is a $50 extra charge for 0-500' range sensor. Selecting the smallest
water level range possible will ensure the greatest accuracy. Includes 25
feet of cable.
|WLEXC Extra Cable
Cable length is measured from top of logger to bottom of sensor. WL400
includes 25 feet of cable, and extra cable can be added up to 500 feet.
Replace the standard stainless steel water level sensor housing with
|PRPP/PRPM Pressure Pipe Option
Water level sensor is housed in a 8" PVC (PRPP) or stainless steel pipe with
3/4" NPT male thread (PRPM) for logging pressure in municipal water
systems. 10' cable standard. Calibrated in psi with ranges of 0 to 30 psi,
60 psi, 100 psi available.
|WL-SWO Sewer Flow Option
Mouse-shaped cover protects sensor from fouling and velocity effects in
sewer, stormwater and irrigation pipe flows. Mouse is attached to 4" X 24"
stainless steel strap for mounting sensor on pipe bottom.
|WL-T Temperature Output Option
Range: 0-50° C, Accuracy: 1% of reading, Output: 0-10mA